gdb/testsuite/gdb.threads/multi-create.c

   1 /* Create threads from multiple threads in parallel.
   2    Copyright 2007-2015 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <pthread.h>
  20 #include <stdio.h>
  21 #include <limits.h>
  22
  23 #define NUM_CREATE 1
  24 #define NUM_THREAD 8
  25
  26 void *
  27 thread_function (void *arg)
  28 {
  29   int x = * (int *) arg;
  30
  31   printf ("Thread <%d> executing\n", x);
  32
  33   return NULL;
  34 }
  35
  36 void *
  37 create_function (void *arg)
  38 {
  39   pthread_attr_t attr;
  40   pthread_t threads[NUM_THREAD];
  41   int args[NUM_THREAD];
  42   int i = * (int *) arg;
  43   int j;
  44
  45   pthread_attr_init (&attr); /* set breakpoint 1 here.  */
  46   pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN);
  47
  48   /* Create a ton of quick-executing threads, then wait for them to
  49      complete.  */
  50   for (j = 0; j < NUM_THREAD; ++j)
  51     {
  52       args[j] = i * 1000 + j;
  53       pthread_create (&threads[j], &attr, thread_function, &args[j]);
  54     }
  55
  56   for (j = 0; j < NUM_THREAD; ++j)
  57     pthread_join (threads[j], NULL);
  58
  59   pthread_attr_destroy (&attr);
  60
  61   return NULL;
  62 }
  63
  64 int
  65 main (int argc, char **argv)
  66 {
  67   pthread_attr_t attr;
  68   pthread_t threads[NUM_CREATE];
  69   int args[NUM_CREATE];
  70   int n, i;
  71
  72   pthread_attr_init (&attr);
  73   pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN);
  74
  75   for (n = 0; n < 100; ++n)
  76     {
  77       for (i = 0; i < NUM_CREATE; i++)
  78         {
  79           args[i] = i;
  80           pthread_create (&threads[i], &attr, create_function, &args[i]);
  81         }
  82
  83       create_function (&i);
  84       for (i = 0; i < NUM_CREATE; i++)
  85         pthread_join (threads[i], NULL);
  86     }
  87
  88   pthread_attr_destroy (&attr);
  89
  90   return 0;
  91 }